I know what bloep1957 is looking for as I often need such a distortion if I take a closeup picture of a ticket for example. I get a bit of barrel distortion which I could easily remove in Photoshop elements if I had a couple of extra handles on the sides. The distort jobs in PE2 don't allow manipulation from the centres of the borders.

Beside the couple of page curl plug-ins, I achived very nice distortions by using one little application called LightSpeed JPG.
For more informations and free download go to:
http://www.fearofphysics.com